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mt cn growing fears bazooka virus will spread to the U. S. during president Barack Obama to call for the rapid development of vaccines and treatments for the disease link to birth defects in newborns US health officials stepping up research on the link between the mosquito borne virus and the defect known as microcephaly in which infants are born with abnormally small head and under developed brains , the virus has been linked to brain damage in thousands of babies in Brazil defenders for disease control warning pregnant women to avoid travel to more than a dozen countries in Latin America and the Caribbean the World Health Organization also warning this week the virus will spread to nearly every country in north and South America as the weather warms and mosquitoes multiply , on Tuesday health officials in Virginia and Arkansas confirmed a resident in each state tested positive for the virus in both cases the resident contracted the disease abroad